mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
18 KiB
JSON
174 lines
18 KiB
JSON
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"questionId": "1834",
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"title": "Minimum Number of People to Teach",
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"content": "<p>On a social network consisting of <code>m</code> users and some friendships between users, two users can communicate with each other if they know a common language.</p>\n\n<p>You are given an integer <code>n</code>, an array <code>languages</code>, and an array <code>friendships</code> where:</p>\n\n<ul>\n\t<li>There are <code>n</code> languages numbered <code>1</code> through <code>n</code>,</li>\n\t<li><code>languages[i]</code> is the set of languages the <code>i<sup>th</sup></code> user knows, and</li>\n\t<li><code>friendships[i] = [u<sub>i</sub>, v<sub>i</sub>]</code> denotes a friendship between the users <code>u<sup></sup><sub>i</sub></code> and <code>v<sub>i</sub></code>.</li>\n</ul>\n\n<p>You can choose <strong>one</strong> language and teach it to some users so that all friends can communicate with each other. Return <i data-stringify-type=\"italic\">the</i> <i><strong>minimum</strong> </i><i data-stringify-type=\"italic\">number of users you need to teach.</i></p>\nNote that friendships are not transitive, meaning if <code>x</code> is a friend of <code>y</code> and <code>y</code> is a friend of <code>z</code>, this doesn't guarantee that <code>x</code> is a friend of <code>z</code>.\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 2, languages = [[1],[2],[1,2]], friendships = [[1,2],[1,3],[2,3]]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> You can either teach user 1 the second language or user 2 the first language.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, languages = [[2],[1,3],[1,2],[3]], friendships = [[1,4],[1,2],[3,4],[2,3]]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> Teach the third language to users 1 and 3, yielding two users to teach.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 <= n <= 500</code></li>\n\t<li><code>languages.length == m</code></li>\n\t<li><code>1 <= m <= 500</code></li>\n\t<li><code>1 <= languages[i].length <= n</code></li>\n\t<li><code>1 <= languages[i][j] <= n</code></li>\n\t<li><code>1 <= u<sub>i</sub> < v<sub>i</sub> <= languages.length</code></li>\n\t<li><code>1 <= friendships.length <= 500</code></li>\n\t<li>All tuples <code>(u<sub>i, </sub>v<sub>i</sub>)</code> are unique</li>\n\t<li><code>languages[i]</code> contains only unique values</li>\n</ul>\n",
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"code": "class Solution(object):\n def minimumTeachings(self, n, languages, friendships):\n \"\"\"\n :type n: int\n :type languages: List[List[int]]\n :type friendships: List[List[int]]\n :rtype: int\n \"\"\"\n ",
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"code": "/**\n * @param {number} n\n * @param {number[][]} languages\n * @param {number[][]} friendships\n * @return {number}\n */\nvar minimumTeachings = function(n, languages, friendships) {\n \n};",
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"code": "class Solution {\n\n /**\n * @param Integer $n\n * @param Integer[][] $languages\n * @param Integer[][] $friendships\n * @return Integer\n */\n function minimumTeachings($n, $languages, $friendships) {\n \n }\n}",
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"code": "class Solution {\n fun minimumTeachings(n: Int, languages: Array<IntArray>, friendships: Array<IntArray>): Int {\n \n }\n}",
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"code": "# @param {Integer} n\n# @param {Integer[][]} languages\n# @param {Integer[][]} friendships\n# @return {Integer}\ndef minimum_teachings(n, languages, friendships)\n \nend",
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"code": "impl Solution {\n pub fn minimum_teachings(n: i32, languages: Vec<Vec<i32>>, friendships: Vec<Vec<i32>>) -> i32 {\n \n }\n}",
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"code": "(define/contract (minimum-teachings n languages friendships)\n (-> exact-integer? (listof (listof exact-integer?)) (listof (listof exact-integer?)) exact-integer?)\n )",
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"code": "-spec minimum_teachings(N :: integer(), Languages :: [[integer()]], Friendships :: [[integer()]]) -> integer().\nminimum_teachings(N, Languages, Friendships) ->\n .",
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"code": "defmodule Solution do\n @spec minimum_teachings(n :: integer, languages :: [[integer]], friendships :: [[integer]]) :: integer\n def minimum_teachings(n, languages, friendships) do\n \n end\nend",
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"You can just use brute force and find out for each language the number of users you need to teach",
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"Note that a user can appear in multiple friendships but you need to teach that user only once"
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